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Table 1 Demographic data of children who returned screening questionnaire between years 2013 and 2016

From: Prevalence and cumulative incidence of autism spectrum disorders and the patterns of co-occurring neurodevelopmental disorders in a total population sample of 5-year-old children

 Total (N = 3954)
 N%MeanSD
Sex
 Boys202251.1  
 Girls193248.9  
Age (months)  62.73.2
Gestational age (weeks)    
 < 28260.7  
 28 < = < 3739710.0  
 37 < = < 42338885.7  
 42 < =1433.6  
Birth weight (g)
 < 1000120.3  
 1000 < = < 1500160.4  
 1500 < = < 25003498.8  
 2500 < = < 4000353189.3  
 4000 < =461.2  
Family structure
 living with parents353289.3  
 living with a single parent3769.5  
 Others461.2  
History of developmental abnormalities1824.6  
Familial annual income
 < JPY 2 million3127.9  
 JPY 2–4 million124231.4  
 JPY 4–7 million145336.7  
 JPY 7–10 million43411.0  
 JPY 10 million < =2015.1  
  1. JPY Japanese yen